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Simple LightDM Manager: Change The LightDM Background Or Logo Using A GUI

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For now, the tool lets you change the LightDM background (and
select between an image or solid color) or the logo and that's
about it. For now there aren't too many things you can tweak about
LightDM anyway but hopefully when we'll have enough LighDM themes,
this tool will also be able to switch between themes.